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Baumoite

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About BaumoiteHide

Formula:
BaU3Mo2O16(H2O)6
Colour:
yellow to orange yellow
Lustre:
Vitreous
Hardness:
Specific Gravity:
4.61 (Calculated)
Crystal System:
Monoclinic
Name:
Named for the composition that includes Ba, U, and Mo (barium, uranium and molybdenum).
New structure type. Unique combination of elements.

Typical features of the structure are twinning and incommensurate modulation. The structure is based on sheets of U6+ and Mo6+-bearing polyhedra, the topology of which is unique. Ba atoms are located in partially occupied sites in the interlayer space, where also water molecules occur.


Classification of BaumoiteHide

Approved
Approval Year:
2017
First Published:
2019

Physical Properties of BaumoiteHide

Vitreous
Transparency:
Translucent
Colour:
yellow to orange yellow
Streak:
pale yellow
Hardness:
2½ on Mohs scale
Comment:
close to
Tenacity:
Brittle
Cleavage:
Perfect
one direction
Fracture:
Irregular/Uneven
Density:
4.61 g/cm3 (Calculated)

Optical Data of BaumoiteHide

Type:
Biaxial (-)
RI values:
nα = 1.716(4) nβ = 1.761(4) nγ = 1.767(4)
2V:
Measured: 42.2°
Max Birefringence:
δ = 0.051
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High

Chemical Properties of BaumoiteHide

Formula:
BaU3Mo2O16(H2O)6

Crystallography of BaumoiteHide

Crystal System:
Monoclinic
Cell Parameters:
a = 9.8337(3) Å, b = 15.0436(5) Å, c = 14.2055(6) Å
β = 108.978(4)°
Ratio:
a:b:c = 0.654 : 1 : 0.944
Unit Cell V:
1987.25 ų
Z:
4
Comment:
Superspace Group: X2/m(α0γ)0 s with X = (0,½,0,½)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.175Å(39)
7.450Å(100)
3.554Å(20)
3.365Å(31)
3.255Å(31)
3.209Å(28)
3.067Å(33)
2.977Å(20)

Type Occurrence of BaumoiteHide

General Appearance of Type Material:
thin crusts of tabular to prismatic crystals
Place of Conservation of Type Material:
Cotype material is deposited in mineralogical collections of the South Australian Museum, North Terrace, Adelaide, South Australia, Australia, registration number G34697
Geological Setting of Type Material:
granite matrix
Associated Minerals at Type Locality:
Reference:
Elliott, P., Plášil, J., Petříček, V., Čejka, J., Bindi, L. (2019) Twinning and incommensurate modulation in baumoite, Ba0.5[(UO2)3O8Mo2(OH)3](H2O)∼3, the first natural Ba uranyl molybdate. Mineralogical Magazine: 83(4): 507-514.

Synonyms of BaumoiteHide

Fluorescence of BaumoiteHide

Bright yellow green under SW UV

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for BaumoiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Elliott, P., Plášil, J., Petríček, V., Čejka, J. and Bindi, L. (2017) Baumoite, IMA 2017-054. CNMNC Newsletter No. 39, October 2017, page 1282; Mineralogical Magazine: 81: 1279–1286.
Elliott, P., Plášil, J., Petříček, V., Čejka, J., Bindi, L. (2019) Twinning and incommensurate modulation in baumoite, Ba0.5[(UO2)3O8Mo2(OH)3](H2O)∼3, the first natural Ba uranyl molybdate. Mineralogical Magazine: 83(4): 507-514.

Internet Links for BaumoiteHide

Localities for BaumoiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia (TL)
 
  • South Australia
    • Olary Province
      • Radium Hill area
Elliott, P., Plášil, J., Petríček, V., Čejka, J. and Bindi, L. (2017) Baumoite, IMA 2017-054. CNMNC Newsletter No. 39, October 2017, page 1282; Mineralogical Magazine: 81: 1279–1286.
 
Mineral and/or Locality  
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